ORGANIC WASTEWATER TREATMENT METHOD, ORGANIC WASTEWATER TREATMENT APPARATUS, AND METHOD FOR IMPROVING ORGANIC WASTEWATER TREATMENT APPARATUS

摘要

PPROBLEM TO BE SOLVED: To provide an organic wastewater treating method capable of enhancing treatment efficiency while suppressing occurrence of trouble in solid/liquid separation. PSOLUTION: In this organic wastewater treating method, a first treatment stream in which organic wastewater is biologically treated while it flows from an organic wastewater introducing part to an activated sludge discharge part, and a second treatment stream in which organic wastewater is biologically treated while it flows from the organic wastewater introducing part to a membrane separation part, are formed in a biological treatment tank. The concentrated liquid after membrane separation is mixed into the activated sludge of the second treatment stream, thereby in the second treatment stream, the organic wastewater is subjected to biological treatment by activated sludge with higher sludge concentration than that of the first treatment stream. PCOPYRIGHT: (C)2008,JPO&INPIT